Amitkumar Karwar [off-list ref] writes:

From: Prameela Rani Garnepudi <redacted>

Rx bluetooth endpoint shall be added in further patches. Rx control
block is introduced here to handle Rx packets properly. Separate
function is written to initialize the RX control blocks.

Signed-off-by: Prameela Rani Garnepudi <redacted>
Signed-off-by: Siva Rebbagondla <redacted>
Signed-off-by: Amitkumar Karwar <redacted>

[...]

+static int rsi_usb_init_rx(struct rsi_hw *adapter)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct rx_usb_ctrl_block *rx_cb;
+	u8 idx;
+
+	for (idx = 0; idx < MAX_RX_URBS; idx++) {
+		rx_cb = &dev->rx_cb[idx];
+
+		rx_cb->rx_buffer = kzalloc(RSI_USB_BUF_SIZE * 2,
+					   GFP_KERNEL | GFP_DMA);

Do you really need GFP_DMA? From the documentation:

 "GFP_DMA exists for historical reasons and should be avoided where
  possible."

-- 
Kalle Valo